Thanks for replies.I have to agree,it's a nicer ride.I initially liked a windshield just to keep warmer at lower temps.And the wind buffeting,lack of wind noise in the ears were just a bonus.One thought about braking and a windshield I got was from when I was a plane Capt. in an F 14 fighter squadron,we would do walk arounds,and on a plane, a thing called a speed brake,is just a flap of metal about 12 in. across,2 of them pop up,on the back of the plane.And greatly reduce the speed.I don't have a batwing or small curved back windscreen.I have the reg. RK,with a wind. up to my eyes.I just thought that someone may have done a test with or without.Something more accurate than I could do.I mean the wind alone could make such a difference.